Spontaneous vs. Expontaneous — What's the Difference?

Happening or arising without apparent external cause; self-generated

Spontaneous: not caused or prompted by an external factor.

Arising from a natural inclination or impulse and not from forethought or prompting

Unconstrained and unstudied in manner or behavior

Growing without cultivation or human labor

Self-generated; happening without any apparent external cause.

Done by one's own free choice, or without planning.

Proceeding from natural feeling or native tendency without external or conscious constraint.

Arising from a momentary impulse.

Controlled and directed internally; self-active; spontaneous movement characteristic of living things.

Produced without being planted or without human cultivation or labor.

Sudden, without warning.

Proceeding from natural feeling, temperament, or disposition, or from a native internal proneness, readiness, or tendency, without constraint; as, a spontaneous gift or proposition.

Proceeding from, or acting by, internal impulse, energy, or natural law, without external force; as, spontaneous motion; spontaneous growth.

Produced without being planted, or without human labor; as, a spontaneous growth of wood.

Happening or arising without apparent external cause;

Said or done without having been planned or written in advance;

Produced without being planted or without human labor;